hashrate issue with avalon 1126 pro 68T

Hey everyone, I've got a situation with my miner and I could really use some advice. It was running smoothly around 67-68T until last week, but now I've noticed the hashrate dropping... It's down to 61.2. Anyone figured out what might be causing this? Here are the logs I have: {'STATUS':[{'STATUS':'S','When':15008,'Code':11,'Msg':'Summary','Description':'cgminer 4.11.1'}],'SUMMARY':[{'Elapsed':15200,'MHS av':62062574.65,'MHS 30s':57003734.89,'MHS 1m':58811438.46,'MHS 5m':60802249.83,'MHS 15m':61174284.77,'Found Blocks':0,'Getworks':555,'Accepted':881,'Rejected':0,'Hardware Errors':731,'Utility':3.48,'Discarded':38661773,'Stale':0,'Get Failures':0,'Local Work':215986,'Remote Failures':0,'Network Blocks':28,'Total MH':943345789878.0000,'Work Utility':866984.26,'Difficulty Accepted':226394112.00000000,'Difficulty Rejected':0.00000000,'Difficulty Stale':0.00000000,'Best Share':244585934,'Device Hardware%':0.0003,'Device Rejected%':0.0000,'Pool Rejected%':0.0000,'Pool Stale%':0.0000,'Last getwork':0} {'STATUS':[{'STATUS':'S','When':15008,'Code':70,'Msg':'CGMiner stats','Description':'cgminer 4.11.1'}],'STATS':[{'STATS':0,'ID':'AVA100','Elapsed':15201,'Calls':0,'Wait':0.000000,'Max':0.000000,'Min':99999999.000000,'MM ID0':'Ver[1126Pro-S-60-21072803_4ec6bb0_211fc46] DNA[02010000b749473c] MEMFREE[1297120.0] NETFAIL[0 0 0 0 0 0 0 0] SYSTEMSTATU[Work: In Work, Hash Board: 2 ] Elapsed[15201] BOOTBY[0x04.00000000] LW[15145861] MH[464 267] HW[731] DH[16.948%] Temp[34] TMax[141] TAvg[74] Fan1[6363] Fan2[6484] Fan3[6404] Fan4[6386] FanR[89%] Vo[329] PS[0 1221 1319 243 3217 1316 3540] PLL0[12064 777 482 597] PLL1[10059 9.

Based on your logs it only detects 2 hashboards which is why the hash rate dropped and I think the reason why the 3rd hashboard is missing is due to overheating look at your chip temps it is more than 85c also notice that Tmax and MTmax it's more than 85c which is overheating. Try to run the miner at normal instead of running the unit at performance mode. If you keep running your unit at performance mode you just killing your hashboard due to over temp unless you can maintain the hashboard at 85c below. You might need an extra fan to cool your miner a bit and it always happens in summer seasons.

Thanks for the answer, The miner has only 2 hash boards by the factory. It can be upgraded to 3 but the stock model is with 2 hashboards. The miner already have 4 fans (2 in, 2out). I will try to run the unit in normal mode. The monitor page tells me that the temps are 74c. You can check the screenshot here:  https://ibb.co/vPRJcpL